envFrom:

Official example:

apiVersion: v1
kind: Pod
metadata:
  name: dapi-test-pod
spec:

  
  containers:
  
    - name: test-container
  
      image: k8s.gcr.io/busybox
  
      command: [ "/bin/sh", "-c", "env" ]
  
      envFrom:
  
      - configMapRef:
  
          name: special-config
  
  restartPolicy: Never